Hi i have had a sony vaio vgn-cr353 brought to me. It keeps powering off, it stays on for about an hour then turns off. After that every 10 mins or so. Everytime there is no error message. I have tried a different power supply, known working ram, and the fan seems to be working and free from dust. I beleive its overheating as it takes a while for it to turn off. Please give me something else to check!!! 
Has anyone else had similar issues, or does anybody know what i can try next??

Has anyone else had similar issues, or does anybody know what i can try next??
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